Hi all,<br/><br/>We've had our new RV for one week now, and I'm not confident that I understand which lever is for draining the black tank and which is for the gray tank.<br/><br/>Here's our configuration:<br/>1. Bay to the left of the wet bay has two levers:<br/>a. Large lever for knife valve directly connected to 3 or 4" pipe<br/>b. Smaller lever for knife valve on passenger side of coach - again, a 3...